CN108807854A - The manufacturing method of electrode laminated body and battery - Google Patents

The manufacturing method of electrode laminated body and battery Download PDF

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Publication number
CN108807854A
CN108807854A CN201810365725.9A CN201810365725A CN108807854A CN 108807854 A CN108807854 A CN 108807854A CN 201810365725 A CN201810365725 A CN 201810365725A CN 108807854 A CN108807854 A CN 108807854A
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China
Prior art keywords
sealing layer
polyethylene particles
electrode
laminated body
partition board
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CN201810365725.9A
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Chinese (zh)
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CN108807854B (en
Inventor
工原孝博
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Toyota Motor Corp
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Toyota Motor Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0468—Compression means for stacks of electrodes and separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Separators (AREA)

Abstract

The present invention provides the manufacturing method of electrode laminated body and battery.The electrode laminated body is made of the 1st partition board, the 1st electrode plate, the 2nd partition board and the 2nd electrode plate integration, 1st partition board has the 1st diaphragm body and is formed in the 1st sealing layer for including the 1st polyethylene particles of the 1st diaphragm body interarea, 2nd partition board has the 2nd diaphragm body and is formed in the 2nd sealing layer for including the 2nd polyethylene particles of the 2nd diaphragm body interarea, the population of 1st polyethylene particles of the unit area of the 1st sealing layer, the population than the 2nd polyethylene particles of the unit area of the 2nd sealing layer are more.

Description

The manufacturing method of electrode laminated body and battery
Technical field
The present invention relates to the 1st partition board, the 1st electrode plate, the 2nd partition board and the 2nd electrode plate is integrated with the sequence stacking Electrode laminated body and have the layered type electrode body being laminated by multiple electrode laminated bodies battery manufacturer Method.
Background technology
Electrode body as batteries such as lithium rechargeable batteries, it is known that by rectangular equal positive plate and negative plate across every Plate it is alternately laminated it is multiple made of laminated type electrode body.The electrode body of such laminated type is manufactured for example, by using following methods. That is, keeping two interareas of the 1st partition board and the 2nd partition board and negative plate closely sealed, their complex is formed.Then, make the complex It is closely sealed with positive plate, the 1st partition board, negative plate, the 2nd partition board, positive plate are formed into integrated electrode with sequence stacking and are laminated Body.Then, electrode laminated body overlapped each other, pressurizeed, keeping its closely sealed, electricity made of the stacking of multiple electrodes laminated body is consequently formed Polar body.To obtain the electrode body of above-mentioned laminated type.Furthermore as with this associated the relevant technologies, such as Japanese spy can be enumerated Table 2015-531989 (with reference to the claim 1 etc. of Japanese Unexamined Patent Application Publication 2015-531989).
Invention content
But when electrode laminated body overlaps each other, pressurizes, keeps its closely sealed, if necessary to high surface pressure, then need Large-scale pressure setting, or have to slow down speed of production, it is easy that the manufacturing cost of electrode body and battery is made to increase.Therefore, It is difficult to make the price reduction of battery.
The present invention provides a kind of manufacturing cost that can reduce electrode body and battery to the electrode for making battery price reduce The manufacturing method of laminated body and battery.
The technical solution of the present invention is by the 1st partition board, the 1st electrode plate, the 2nd partition board and the 2nd electrode plate with the sequential layer Folded and integrated electrode laminated body, the 1st partition board have the 1st diaphragm body comprising multiple aperture plasma membrane and are formed in described 1st sealing layer of the Porous on the interarea with the 1st electrode plate side opposite side of the 1st diaphragm body, the 1st sealing layer Including the 1st polyethylene particles and by the 1st polyethylene particles each other and by the 1st polyethylene particles with the described 1st every Plate body bond binder, the 2nd partition board have the 2nd diaphragm body comprising multiple aperture plasma membrane and be formed in the described 2nd every 2nd sealing layer of the Porous on the interarea with the 1st electrode plate side opposite side of plate body, the 2nd sealing layer and institute It is closely sealed to state the 2nd electrode plate, including the 2nd polyethylene particles and by the 2nd polyethylene particles each other and by the 2nd poly- second The binder that alkene particle is bonded with the 2nd diaphragm body, the 1st poly- second of the unit area of the 1st sealing layer The population of alkene particle, the population than the 2nd polyethylene particles of the unit area of the 2nd sealing layer are more.
In the electrode laminated body, make the population ratio institute of the 1st polyethylene particles of the unit area of the 1st sealing layer The population for stating the 2nd polyethylene particles of the unit area of the 2nd sealing layer is more.It is found out through investigation according to what the present inventor carried out, When forming electrode body electrode laminated body to be laminated, by the 1st sealing layer of the 1st partition board of electrode laminated body and another electricity 2nd electrode plate of pole laminated body is overlapped, and is pressurizeed to it, when keeping electrode laminated body closely sealed each other by the 1st sealing layer, with the 1st polyethylene particles number of the unit area of 1 sealing layer is more, the 1st polyethylene particles and the 2nd electrode plate of the 1st sealing layer Contact point is more, and the closing force of the 1st sealing layer and the 2nd electrode plate is stronger.
On the other hand it is also aware that, is identical population in the 1st polyethylene particles number of the unit area of the 1st sealing layer In the case of, according to surface pressure when keeping electrode laminated body closely sealed each other, enhanced by the closing force that the 1st sealing layer is realized.That is, if Increase the surface pressure, then moderate finite deformation occurs for the 1st polyethylene particles of the 1st sealing layer, the 1st sealing layer and the 2nd electrode plate Contact area increases, and the closing force of the 1st sealing layer and the 2nd electrode plate enhances.On the contrary, if reducing the surface pressure, the 1st The deformation of polyethylene particles is smaller, and the contact area of the 1st sealing layer and the 2nd electrode plate reduces, the 1st sealing layer and the 2nd electrode plate Closing force weaken.
About the 1st sealing layer of the electrode laminated body, due to the 1st polyethylene particles of the unit area of the 1st sealing layer The 2nd sealing layer of population ratio it is more, therefore as described above when keeping electrode laminated body closely sealed each other by the 1st sealing layer, the 1st is close The 1st polyethylene particles and the contact point of the 2nd electrode plate for closing layer increase, and the closing force of the 1st sealing layer becomes than the 2nd sealing layer Closing force is stronger.Therefore, the 1st can be made if even if reducing surface pressure when being pressurizeed and keeping electrode laminated body closely sealed each other Sealing layer and the 2nd electrode plate are closely sealed well.It is pressurizeed therefore, it is possible to be used in and makes electrode laminated body closely sealed pressure each other Device miniaturization processed, or raising speed of production can make battery so as to inhibit the manufacturing cost of electrode body and battery Price reduction.
Furthermore as " binder " for the 1st sealing layer and the 2nd sealing layer, such as the bonding of acrylic acid series can be enumerated Agent.
In addition, as the electrode laminated body, the average grain diameter that can be set as the 1st polyethylene particles is less than described the The electrode laminated body of the average grain diameter of 2 polyethylene particles.
In the electrode laminated body, the average grain diameter of the 1st polyethylene particles of the 1st sealing layer is made to be less than the 2nd sealing layer The average grain diameter of 2nd polyethylene particles, therefore be easy to configure more 1st polyethylene particles in the unit area of the 1st sealing layer, It is easy the 1st sealing layer that the population of the 1st polyethylene particles of setting unit area increases.Furthermore polyethylene particles " average grain diameter " measured by granularmetric analysis (JISZ8825).
In addition, as the electrode laminated body, the average grain diameter that can be set as the 1st polyethylene particles is 0.3~1.0 μm, the electrode laminated body that the average grain diameters of the 2nd polyethylene particles is 2.0~4.0 μm.
In the electrode laminated body, the average grain diameter of the 1st polyethylene particles of the 1st sealing layer is set as 0.3~1.0 μm, Therefore the 1st polyethylene particles are easily processed, are easy that the 1st sealing layer is arranged using the 1st polyethylene particles.In addition, closely sealed by the 2nd The average grain diameter of 2nd polyethylene particles of layer is set as 2.0~4.0 μm, therefore is easily processed the 2nd polyethylene particles, is easy to use The 2nd sealing layer is arranged in 2nd polyethylene particles.
In addition, another technical solution is a kind of manufacturing method of battery, the battery has multiple electrodes laminate layers The electrode body of laminated type made of folded, the electrode laminated body is by the 1st partition board, the 1st electrode plate, the 2nd partition board and the 2nd electrode plate Made of the sequence stacking and integration, the 1st partition board has the 1st diaphragm body comprising multiple aperture plasma membrane and is formed in 1st sealing layer of the Porous on the interarea with the 1st electrode plate side opposite side of the 1st diaphragm body, the described 1st is close Close layer include the 1st polyethylene particles and by the 1st polyethylene particles each other and by the 1st polyethylene particles with it is described The binder that 1st diaphragm body bonds, the 2nd partition board have the 2nd diaphragm body comprising multiple aperture plasma membrane and are formed in described 2nd sealing layer of the Porous on the interarea with the 1st electrode plate side opposite side of the 2nd diaphragm body, the 2nd sealing layer It is closely sealed with the 2nd electrode plate, including the 2nd polyethylene particles and by the 2nd polyethylene particles each other and by the described 2nd The binder that polyethylene particles are bonded with the 2nd diaphragm body, the described 1st of the unit area of the 1st sealing layer the The population of polyethylene particles, the population than the 2nd polyethylene particles of the unit area of the 2nd sealing layer is more, institute The manufacturing method for stating battery is characterised by comprising：The 1st partition board, the 1st electrode plate will be respectively become by cut-out It is formed with sequence stacking with band-like 1st partition board, band-like 1st electrode plate and band-like 2nd partition board of the 2nd partition board integrated Band-like complex；In such a way that the 2nd sealing layer of band-like 2nd partition board is Chong Die with the 2nd electrode plate, by the band Shape complex is Chong Die with the 2nd electrode plate, is pressurizeed to the band-like complex and the 2nd electrode plate by roll-in, makes institute It states band-like complex and the 2nd electrode plate is closely sealed, obtain band electrode laminated body；The band electrode laminated body is cut off, Form the electrode laminated body of predetermined shape；Following steps form the electrode body repeatedly：With the electrode laminated body The 1st sealing layer of 1st partition board mode Chong Die with the 2nd electrode plate of another electrode laminated body, by this Electrode laminated body is Chong Die with another electrode laminated body, is suppressed to the electrode laminated body and another electrode laminated body by plane Pressurization, keeps the electrode laminated body and another electrode laminated body closely sealed.
In the manufacturing method of the battery, is being pressurizeed, made to the band-like complex and the 2nd electrode plate by roll-in The band-like complex and the 2nd electrode plate are closely sealed, when obtaining band electrode laminated body, are added as described above using roll-in Pressure, keeps band-like complex and the 2nd electrode plate closely sealed by the 2nd sealing layer.In 2nd sealing layer, the unit area of the 2nd sealing layer The 1st sealing layer of population ratio of 2nd polyethylene particles is few, in order to keep band-like complex and the 2nd electrode plate closely sealed well and need Want higher pressing pressure.But roll-in is compared with plane is suppressed, can easily to band-like complex and the 2nd electrode plate apply compared with High pressure.Therefore, band-like complex and the 2nd electrode plate can be made closely sealed well by roll-in.
On the other hand, plane compacting is being iterated through to electrode laminated body pressurization, make the electrode laminated body and another electricity Pole laminated body is closely sealed, when to form the electrode body, is pressurizeed as described above using plane compacting, passes through the 1st sealing layer Keep electrode laminated body closely sealed each other.In 1st sealing layer, the population ratio of the 1st polyethylene particles of the unit area of the 1st sealing layer 2nd sealing layer is more, compared to band-like complex and the closely sealed situation of the 2nd electrode plate is made, can lead to if even if reducing pressing pressure It crosses the 1st sealing layer and obtains good adaptation, therefore electrode laminated body can be made closely sealed well each other by plane compacting.From And the pressure setting of carry out plane compacting can be made to minimize, or speed of production is improved, electrode body and the system of battery can be inhibited This is caused, the price reduction of battery is made.
In addition, the manufacturing method as the battery, the average grain diameter that can be set as the 1st polyethylene particles is less than institute State the manufacturing method of the battery of the average grain diameter of the 2nd polyethylene particles.
In the manufacturing method of the battery, the average grain diameter of the 1st polyethylene particles of the 1st sealing layer is set to be less than the 2nd closely sealed The average grain diameter of 2nd polyethylene particles of layer, therefore be easy to configure more 1st polyethylene in the unit area of the 1st sealing layer Particle is easy the 1st sealing layer that the population of the 1st polyethylene particles of the unit area of the 1st sealing layer of setting increases.
In addition, the manufacturing method as the battery, the average grain diameter that can be set as the 1st polyethylene particles is 0.3 ~1.0 μm, the manufacturing method for the battery that the average grain diameters of the 2nd polyethylene particles is 2.0~4.0 μm.
In the manufacturing method of the battery, the average grain diameter of the 1st polyethylene particles of the 1st sealing layer is set as 0.3~1.0 μm, therefore the 1st polyethylene particles are easily processed, it is easy that the 1st sealing layer is arranged using the 1st polyethylene particles.In addition, by the 2nd The average grain diameter of 2nd polyethylene particles of sealing layer is set as 2.0~4.0 μm, therefore is easily processed the 2nd polyethylene particles, is easy Using the 2nd polyethylene particles, the 2nd sealing layer is set.
Description of the drawings
In the following, being said to the feature, advantage, technology and industrial significance of exemplary embodiment of the present invention with reference to attached drawing It is bright, wherein identical label indicates identical element.
Fig. 1 is the sectional view for the electrode laminated body that embodiment is related to.
Fig. 2 is the enlarged partial sectional view near the 1st sealing layer among the electrode laminated body that embodiment is related to.
Fig. 3 is the enlarged partial sectional view near the 2nd sealing layer among the electrode laminated body that embodiment is related to.
Fig. 4 is the sectional view for the electrode body that embodiment is related to.
Fig. 5 is the stereogram for the battery that embodiment is related to.
Fig. 6 is the sectional view for the battery that embodiment is related to.
Fig. 7 is the flow chart of the manufacturing method for the battery that embodiment is related to.
Fig. 8 is the definition graph for the state that the expression that embodiment is related to forms electrode body.
Fig. 9 is for embodiment and to compare the position offset for exemplifying and being generated when electrode laminated body is stacked on one another Chart.
Specific implementation mode
Hereinafter, the embodiments of the present invention will be described with reference to the drawings.Fig. 1 shows electrode layer of the present embodiment The sectional view of stack 100.In addition, Fig. 2 shows the partial enlargement section views near the 1st sealing layer 133 among electrode laminated body 100 Figure, Fig. 3 show the enlarged partial sectional view near the 2nd sealing layer 143.In addition, Fig. 4 is shown multiple electrode laminated bodies 100 The electrode body 20 being laminated.In addition, Fig. 5 and Fig. 6 show the stereogram and sectional view for the battery 1 for having the electrode body 20.Again Longitudinal EH of electrode laminated body 100, transverse direction FH and thickness direction GH are set to Fig. 1~direction shown in fig. 6 below and said by person It is bright.In addition, battery longitudinal direction BH, the battery transverse direction CH of battery 1 and cell thickness direction DH are set to Fig. 5 and direction shown in fig. 6 It illustrates.
Electrode laminated body 100 is (referring to Fig.1) the 1st partition board 130, negative plate (the 1st electrode plate) 120,140 and of the 2nd partition board Positive plate (the 2nd electrode plate) 110 is with made of the sequence stacking and integration.Wherein, positive plate 110 is that have the 1st anode main The rectangular plate-like of the positive interarea 110b of face 110a and the 2nd, is that positive electrode active material layer 113,113 is respectively set with rectangular shape It is formed in two interareas of aluminium foil, that is, positive electrode collector foil 111 of rectangle.These positive electrode active material layers 113,113 include just Pole active material, conductive material and binder.Among positive plate 110, the end in the left side in Fig. 1 is formed as in thickness direction Positive electrode active material layer 113 is not present in (upper and lower directions in Fig. 1), to which positive electrode collector foil 111 is exposed in a thickness direction Positive exposed division 110m.
Negative plate 120 is the rectangular plate-like with the 1st cathode interarea 120a and the 2nd cathode interarea 120b, is that cathode is lived Property material layer 123,123 is separately positioned on two interareas of the i.e. negative electrode collector foil 121 of copper foil of rectangle with rectangular shape and is formed 's.These negative electrode active material layers 123,123 include negative electrode active material, binder and tackifier.Among negative plate 120, Fig. 1 In right side end, be formed as on thickness direction (upper and lower directions in Fig. 1) be not present negative electrode active material layer 123, from And the cathode exposed division 120m that negative electrode collector foil 121 is exposed in a thickness direction.
1st cathode interarea 120a of the 1st partition board 130 and negative plate 120 is closely sealed.1st partition board 130 includes rectangular plate-like 1st diaphragm body 131, downside (opposite side of negative plate 120) in Fig. 1 among the 1st diaphragm body 131 the 1st master The entire surface of face 131a and the 1st sealing layer 133 of Porous that is formed and in Fig. 1 among the 1st diaphragm body 131 The entire surface of 2nd interarea 131b of upside (120 side of negative plate) and the 3rd sealing layer 137 of Porous formed.
Wherein, it is 10~30 μm (being 20 μm in present embodiment) that the 1st diaphragm body 131, which is the thickness comprising polyethylene, Multiple aperture plasma membrane.In addition, it is D1 (in present embodiment that the 1st sealing layer 133, which is comprising average grain diameter (in addition to Fig. 1 can also refer to Fig. 2), D1=0.6 μm) the 1st polyethylene particles 134 and by the 1st polyethylene particles 134 each other and by the 1st polyethylene particles 134 with The thickness for the binder (be acrylic binder in present embodiment) 135 that 1st diaphragm body 131 bonds is porous for 5 μm Matter layer.Furthermore the record of binder 135 is omitted in fig. 2.In addition, the 1st polyethylene particles 134 and aftermentioned 3rd poly- second Each average grain diameter D1, D3, D2, D4 of alkene particle 138, the 2nd polyethylene particles 144, the 4th polyethylene particles 148 are logical as described above It crosses granularmetric analysis (JISZ8825) and measures.
The ratio of the 1st polyethylene particles 134 in 1st sealing layer 133 is 95wt%, and the ratio of binder 135 is 5wt%.In addition, each sealing layer of aftermentioned 3rd sealing layer 137, the 2nd sealing layer 143 and the 4th sealing layer 147 is also the same, poly- second The ratio of alkene particle (the 3rd polyethylene particles 138, the 2nd polyethylene particles 144 and the 4th polyethylene particles 148) is 95wt%, is glued The ratio for tying agent 135 is 5wt%.In addition, the particle of the 1st polyethylene particles 134 of unit area about the 1st sealing layer 133 Number N1, N1=2.7 × 10 in present embodiment8A/cm2, than the 2nd polyethylene of the unit area of aftermentioned 2nd sealing layer 143 (N2=1.1 × 10 in present embodiment population N2 of particle 1447A/cm2) more (N1 > N2) (with reference to Fig. 2 and Fig. 3).
On the other hand, the 3rd sealing layer 137 is poly- comprising the 3rd that average grain diameter is D3 (in present embodiment D3=3.0 μm) Beta particles 138 and the 3rd polyethylene particles 138 are glued each other and by the 3rd polyethylene particles 138 with the 1st diaphragm body 131 The porous layer that the thickness of the binder 135 of knot is 5 μm.1st cathode interarea of the 3rd sealing layer 137 and negative plate 120 120a is closely sealed, keeps the 1st partition board 130 and negative plate 120 closely sealed by the 3rd sealing layer 137.Furthermore about the 3rd sealing layer 137 Unit area the 3rd polyethylene particles 138 population N3, N3=1.1 × 10 in present embodiment7A/cm2。
2nd partition board 140 is close with the 2nd cathode interarea 120b of negative plate 120 between negative plate 120 and positive plate 110 It closes, and closely sealed with the 1st positive interarea 110a of positive plate 110.2nd partition board 140 includes the 2nd diaphragm body of rectangular plate-like 141, the 1st interarea 141a's of the upside (opposite side of negative plate 120) in Fig. 1 among the 2nd diaphragm body 141 is entire Face and the 2nd sealing layer 143 of Porous and the downside (negative plate in Fig. 1 among the 2nd diaphragm body 141 formed 120 sides) the 2nd interarea 141b entire surface and the 4th sealing layer 147 of Porous that is formed.
Wherein, the 2nd diaphragm body 141 is in the same manner as the 1st diaphragm body 131, be the thickness comprising polyethylene is 10~30 μ The multiple aperture plasma membrane of m (being 20 μm in present embodiment).In addition, it includes flat that the 2nd sealing layer 143 is (in addition to Fig. 1 can also refer to Fig. 3) Equal grain size be the 2nd polyethylene particles 144 of D2 (in present embodiment D2=3.0 μm) and by the 2nd polyethylene particles 144 each other And the Porous that the thickness for the binder 135 for bonding the 2nd polyethylene particles 144 and the 2nd diaphragm body 141 is 5 μm Layer.Furthermore the record of binder 135 is omitted in figure 3.1st positive interarea 110a of the 2nd sealing layer 143 and positive plate 110 It is closely sealed, keep the 2nd partition board 140 and positive plate 110 closely sealed by the 2nd sealing layer 143.Unit plane about the 2nd sealing layer 143 The population N2 of the 2nd long-pending polyethylene particles 144, N2=1.1 × 10 in present embodiment7A/cm2。
In addition, the 4th sealing layer 147 is comprising the 4th polyethylene that average grain diameter is D4 (in present embodiment D4=3.0 μm) Particle 148 and the 4th polyethylene particles 148 are bonded each other and by the 4th polyethylene particles 148 and the 2nd diaphragm body 141 The porous layer that the thickness of the binder 135 is 5 μm.2nd cathode interarea 120b of the 4th sealing layer 147 and negative plate 120 It is closely sealed, keep the 2nd partition board 140 and negative plate 120 closely sealed by the 4th sealing layer 147.Furthermore about the list of the 4th sealing layer 147 The population N4 of 4th polyethylene particles 148 of plane product, N4=1.1 × 10 in present embodiment7A/cm2。
Then, the electrode body 20 and battery 1 that use the electrode laminated body 100 to manufacture are illustrated (with reference to Fig. 4~figure 6).The electrode body 20 is substantially rectangular parallelepiped, and being will be made of the stacking of multiple electrode laminated bodies 100 and integration.Specifically For, with the positive plate 110 of the 1st sealing layer 133 and another electrode laminated body 100 of the 1st partition board 130 of electrode laminated body 100 Multiple electrodes laminated body 100 is laminated closely sealed form on thickness direction GH.The positive plate 110 of rectangle is constituted as a result, and is born Pole plate 120 across partition board (the 1st partition board 130 or the 2nd partition board 140) it is alternately laminated it is multiple made of laminated type electrode body.The electricity It is close that polar body 20 is incorporated in the square mounted such as vehicles such as hybrid vehicle, plug-in hybrid-power automobile, electric vehicle In the lithium rechargeable battery (hereinafter also referred to as " battery ") 1 of closed form.
Battery 1 is supported just by battery case 10, the storage electrode body 20 inside it and by battery case 10 Pole terminal component 50 and negative terminal component 60 etc. are constituted.In addition, being accommodated with electrolyte 17, part of it in battery case 10 It is infiltrated in electrode body 20.Wherein, battery case 10 is cuboid box-like and includes metal (being aluminium in present embodiment).The electricity Pond shell 10 has the housing body component 11 of bottom tube and to block opening for the housing body component 11 by only upper side opening Mouthful form and the shell The lid component 13 of rectangular plate-like welded is constituted.
Including the positive terminal component 50 of aluminium is fixed at shell The lid component with the state to insulate with shell The lid component 13 13.The positive terminal component 50 connects in battery case 10 with the positive exposed division 110m of each positive plate 110 among electrode body 20 Conducting is connect, and outside batteries are extended to through shell The lid component 13.In addition, the negative terminal component 60 comprising copper with shell The state that body The lid component 13 insulate is fixed at shell The lid component 13.The negative terminal component 60 is in battery case 10 and electric The cathode exposed division 120m connections conducting of each negative plate 120 among polar body 20, and extend to electricity through shell The lid component 13 Outside pond.In addition, being surrounded configured with the bag-shaped insulation film as insulation film between electrode body 20 and battery case 10 Body 19.
As described above, in the electrode laminated body 100 of present embodiment, keep the 1st of the unit area of the 1st sealing layer 133 poly- The population N1 of beta particles 134 is more than the population N2 of the 2nd polyethylene particles 144 of the unit area of the 2nd sealing layer 143 (N1 > N2).As described later, when forming electrode body 20 electrode laminated body 100 to be laminated, by the 1st of electrode laminated body 100 the 1st sealing layer 133 of partition board 130 is Chong Die with the positive plate 110 of another electrode laminated body 100, and pressurizes to it, close by the 1st When closing layer 133 keeps electrode laminated body 100 closely sealed each other, as the population N1 of the unit area of the 1st sealing layer 133 is more, the 1st The 1st polyethylene particles 134 and the contact point of positive plate 110 of sealing layer 133 are more, the 1st sealing layer 133 and positive plate 110 Closing force is stronger.
On the other hand, as described later, in the feelings that the population N1 of the unit area of the 1st sealing layer 133 is identical population Under condition, according to surface pressure when keeping electrode laminated body 100 closely sealed each other, enhanced by the closing force that the 1st sealing layer 133 is realized.That is, If increasing the surface pressure, moderate finite deformation, the 1st sealing layer 133 occur for the 1st polyethylene particles 134 of the 1st sealing layer 133 Increase with the contact area of positive plate 110, the closing force of the 1st sealing layer 133 and positive plate 110 enhances.On the contrary, if reducing institute State surface pressure, then the deformation of the 1st polyethylene particles 134 is smaller, and the contact area of the 1st sealing layer 133 and positive plate 110 reduces, The closing force of 1st sealing layer 133 and positive plate 110 weakens.
In 1st sealing layer 133 of the electrode laminated body 100 of present embodiment, the 1st polyethylene particles 134 of unit area Population N1 than the 2nd sealing layer more than 143, therefore when keeping electrode laminated body 100 closely sealed each other by the 1st sealing layer 133, The 1st polyethylene particles 134 and the contact point of positive plate 110 of 1 sealing layer 133 increase, and the closing force of the 1st sealing layer 133 becomes Closing force than the 2nd sealing layer 143 is stronger.Therefore, even if reducing when being pressurizeed and keeping electrode laminated body 100 closely sealed each other Surface pressure can also make the 1st sealing layer 133 and positive plate 110 closely sealed well.Thus it is possible to make to be pressurizeed and by electrode Closely sealed aftermentioned plane pressing part 270 (with reference to Fig. 8) miniaturization each other of laminated body 100, or speed of production is improved, so as to The manufacturing cost for enough inhibiting electrode body 20 and battery 1, can make the price reduction of battery 1.
In addition, in the electrode laminated body 100 of present embodiment, make the flat of the 1st polyethylene particles 134 of the 1st sealing layer 133 Equal grain size D1 is less than the average grain diameter D2 (D1 < D2) of the 2nd polyethylene particles 144 of the 2nd sealing layer 143, therefore as described later, It is easy to configure more 1st polyethylene particles 134 in the unit area of the 1st sealing layer 133, is easy the 1st of setting unit area The 1st sealing layer 133 that the population N1 of polyethylene particles 134 is increased.
In addition, in the electrode laminated body 100 of present embodiment, by the flat of the 1st polyethylene particles 134 of the 1st sealing layer 133 Equal grain size D1 is set as 0.3~1.0 μm, therefore as described later, is easily processed the 1st polyethylene particles 134, is easy poly- using the 1st The 1st sealing layer 133 is arranged in beta particles 134.In addition, by the average grain diameter D2 of the 2nd polyethylene particles 144 of the 2nd sealing layer 143 2.0~4.0 μm are set as, therefore as described later, is easily processed the 2nd polyethylene particles 144, is easy to use the 2nd polyethylene particles 144 the 2nd sealing layers 143 of setting.
Then, the manufacturing method of the battery 1 is illustrated (with reference to Fig. 7 and Fig. 8).First, in " positive plate formation work In sequence S1 ", the band-like positive plate for being used as positive plate 110 is formed by cutting off.That is, preparing band-like aluminium foil, that is, positive electrode collector foil 111, on the interarea of one side, coating positive active material, conductive material and binder are kneaded together with decentralized medium and At positive pole paste, and be thermally dried, form positive electrode active material layer 113.In addition, in the opposite side of positive electrode collector foil 111 Interarea be similarly coated with the positive pole paste, be thermally dried and form positive electrode active material layer 113.Then, roller is utilized Press suppresses the positive plate, improves the density of positive electrode active material layer 113,113.Band-like positive plate is consequently formed.
In addition, carrying out " negative plate formation process S2 ", the band-like negative plate (band for being used as negative plate 120 is formed by cutting off The 1st electrode plate of shape) 120x.That is, preparing band-like copper foil, that is, negative electrode collector foil 121, on the interarea of one side, it is coated with cathode Negative electrode paste made of active material, binder and tackifier are kneaded together with decentralized medium, and be thermally dried, form cathode Active material layer 123.In addition, being similarly coated with the negative electrode paste on the interarea of the opposite side of negative electrode collector foil 121, carry out Heat drying and form negative electrode active material layer 123.Then, the negative plate is suppressed using roll squeezer, improves cathode and lives The density of property material layer 123,123.Band-like negative plate 120x is consequently formed.
In addition, carrying out " the 1st partition board formation process S3 ", band-like 1st partition board for being used as the 1st partition board 130 is formed by cutting off 130x.That is, preparing the 1st band-like diaphragm body 131 of the multiple aperture plasma membrane comprising polyethylene, the of the 1st diaphragm body 131 1 interarea 131a forms the 1st sealing layer 133.Specifically, making binder (being acrylic binder in present embodiment) 135 It is the 1st polyethylene particles 134 of D1 (in present embodiment D1=0.6 μm) with average grain diameter, with the 1st polyethylene particles 134 The mode that ratio is 95wt%, the ratio of binder 135 is 5wt% is scattered in decentralized medium (specifically water).Then, Entire surface by the dispersion liquid throughout the 1st interarea 131a of the 1st diaphragm body 131 is coated, and heat drying, in the 1st master The 1st sealing layer 133 that thickness is 5 μm is formed on the 131a of face.
The population N1 of 1st polyethylene particles 134 of the unit area of the 1st sealing layer 133 formed in this way is N1=2.7 ×108A/cm2, than the population N2 (N2=1.1 of the 2nd polyethylene particles 144 of the unit area of aftermentioned 2nd sealing layer 143 ×107A/cm2) more (N1 > N2) (with reference to Fig. 2 and Fig. 3).In addition, after making the average grain diameter D1 of the 1st polyethylene particles 134 be less than The average grain diameter D2 (D1 < D2) of 2nd polyethylene particles 144 of the 2nd sealing layer 143 stated, therefore be easy in the 1st sealing layer 133 Unit area configure more 1st polyethylene particles 134, be easy the particle of the 1st polyethylene particles 134 of setting unit area The 1st sealing layer 133 that number N1 is increased.In addition, the average grain diameter D1 of the 1st polyethylene particles 134 is set as 0.3~1.0 μm, because This is easily processed the 1st polyethylene particles 134, is easy that the 1st sealing layer 133 is arranged using the 1st polyethylene particles 134.
In addition, the 2nd interarea 131b in the 1st diaphragm body 131 forms the 3rd sealing layer 137.Specifically, making described viscous Agent 135 and average grain diameter are tied for the 3rd polyethylene particles 138 of D3 (in present embodiment D3=3.0 μm), with the 3rd polyethylene grain Son 138 ratio be 95wt%, the mode that the ratio of binder 135 is 5wt%, be scattered in the decentralized medium.Then, by this Dispersion liquid is coated throughout the entire surface of the 2nd interarea 131b of the 1st diaphragm body 131, and heat drying, in the 2nd interarea The 3rd sealing layer 137 that thickness is 5 μm is formed on 131b.3rd polyethylene of the unit area of the 3rd sealing layer 137 formed in this way The population N3 of particle 138 is N3=1.1 × 107A/cm2.Being formed in the 1st diaphragm body 131 as a result, has the 1st sealing layer The band-like 1st partition board 130x (referring to Fig.1 etc.) of 133 and the 3rd sealing layer 137.
In addition, carrying out " the 2nd partition board formation process S4 ", band-like 2nd partition board for being used as the 2nd partition board 140 is formed by cutting off 140x.That is, preparing the 2nd band-like diaphragm body 141 of the multiple aperture plasma membrane comprising polyethylene, the of the 2nd diaphragm body 141 1 interarea 141a forms the 2nd sealing layer 143.Specifically, the binder 135 and average grain diameter is made to be D2 (in present embodiment D2=3.0 μm) the 2nd polyethylene particles 144, the ratio with the 2nd polyethylene particles 144 is 95wt%, the ratio of binder 135 For the mode of 5wt%, it is scattered in the decentralized medium.Then, which is spread to the 1st interarea of the 2nd diaphragm body 141 The entire surface of 141a is coated, and heat drying, and the 2nd sealing layer 143 that thickness is 5 μm is formed on the 1st interarea 141a.This The population N2 of 2nd polyethylene particles 144 of the unit area for the 2nd sealing layer 143 that sample is formed is N2=1.1 × 107A/ cm2.In addition, in present embodiment, the average grain diameter D2 of the 2nd polyethylene particles 144 is set as 2.0~4.0 μm, therefore be easy place The 2nd polyethylene particles 144 are managed, are easy that the 2nd sealing layer 143 is arranged using the 2nd polyethylene particles 144.
In addition, the 2nd interarea 141b in the 2nd diaphragm body 141 forms the 4th sealing layer 147.Specifically, by described viscous Agent 135 and average grain diameter are tied for the 4th polyethylene particles 148 of D4 (in present embodiment D4=3.0 μm), with the 4th polyethylene grain Son 148 ratio be 95wt%, the mode that the ratio of binder 135 is 5wt%, be scattered in the decentralized medium.Then, by this Dispersion liquid is coated throughout the entire surface of the 2nd interarea 141b of the 2nd diaphragm body 141, and heat drying, in the 2nd interarea The 4th sealing layer 147 that thickness is 5 μm is formed on 141b.The 4th of unit area about the 4th sealing layer 147 formed in this way is poly- The population N4 of beta particles 148, N4=1.1 × 10 in present embodiment7A/cm2.The shape in the 2nd diaphragm body 141 as a result, At the band-like 2nd partition board 140x (referring to Fig.1 etc.) with the 2nd sealing layer 143 and the 4th sealing layer 147.
Then, using these band-like positive plates, band-like negative plate 120x, band-like 1st partition board 130x and band-like 2nd partition board 140x forms electrode body 20 by electrode body manufacturing device 200.First, (reference is illustrated to electrode body manufacturing device 200 Fig. 8).The electrode body manufacturing device 200 has negative plate supply unit 210, the 1st partition board supply unit 220, the 2nd partition board supply unit 230, the 1st roll-in portion 240, the 2nd roll-in portion 250,260 peace face pressing part 270 of cutting portion.
Wherein, the band-like negative plate 120x being wound onto on let off roll 211 is installed in negative plate supply unit 210, from this Negative plate supply unit 210 by band-like negative plate 120x, send out along its length by (left and right directions in Fig. 8).It is supplied in negative plate The lower section in portion 210 is configured with the 1st partition board supply unit 220.It is equipped in the 1st partition board supply unit 220 and is wound onto let off roll 221 On band-like 1st partition board 130x, sent out along its length from the 1st partition board supply unit 220 by band-like 1st partition board 130x.Separately Outside, it is configured with the 2nd partition board supply unit 230 in the top of negative plate supply unit 210.The 2nd partition board supply unit 230 be equipped with by Band-like 2nd partition board 140x on let off roll 231, from the 2nd partition board supply unit 230 by band-like 2nd partition board 140x along it Length direction is sent out.
1st roll-in portion 240 is by roll-in to band-like 1st partition board 130x, band-like negative plate 120x and band-like 2nd partition board 140x pressurizes and makes its integrated position.Specifically, the 1st roll-in portion 240 has the 1st pressure that roller surface 241c is stainless steel Roller 241 and vacate the 2nd pressure roller 243 that the roller surface 243c of gap and configured in parallel is stainless steel with it.In the 1st pressure roller 241 With in the gap of the 2nd pressure roller 243, to band-like 1st partition board 130x, band-like negative plate 120x and band-like 2nd partition board 140x along length Direction continuous pressure and make its integration, form band-like complex 150.
2nd roll-in portion 250 configures in the downstream in the 1st roll-in portion 240.2nd roll-in portion 250 is to band-like complex 150 Make its integrated position with the rectangular pressurization of positive plate 110 is cut off.Specifically, the 2nd roll-in portion 250 has roller surface 251c is the 3rd pressure roller 251 of stainless steel and vacates the 4th pressure that the roller surface 253c of gap and configured in parallel is stainless steel with it Roller 253.It is continuous to the positive plate 110 of band-like complex 150 and rectangle in the gap of the 3rd pressure roller 251 and the 4th pressure roller 253 It pressurizes and makes its integration, form band electrode laminated body 100x.
Cutting portion 260 configures in the downstream in the 2nd roll-in portion 250.The cutting portion 260 is that band electrode laminated body 100x exists It is cut off every predetermined space on length direction, forms the electrode laminated body of predetermined shape (being rectangle in present embodiment) 100 position.
Plane pressing part 270 is to make electrode laminated body by plane compacting pressurizes to multiple electrodes laminated body 100 100 positions being integrated with each other.Specifically, plane pressing part 270 have upper mold 271 and with lower die 273, the upper mold 271 tool There is flat press face 271n, which has the flat press face 273n opposite with the press face 271n of mo(u)ld top half 271.
When forming electrode body 20 using the electrode body manufacturing device 200, first in " the 1st roll process S5 ", formed Band-like 1st partition board 130x, band-like negative plate 120x and band-like 2nd partition board 140x is integrated band-like multiple with the sequence stacking Zoarium 150.Specifically, the band-like negative plate 120x transferred out from negative plate supply unit 210, defeated from the 1st partition board supply unit 220 The band-like 1st partition board 130x sent out the and band-like 2nd partition board 140x transferred out from the 2nd partition board supply unit 230, respectively to the 1st Roll-in portion 240 conveys.
In the 1st pressure roller 241 in the 1st roll-in portion 240 and the gap of the 2nd pressure roller 243, for band-like 1st partition board 130x's 3rd sealing layer 137 is Chong Die with band-like the 1st cathode interarea 120a of negative plate 120x and the 4th of band-like 2nd partition board 140x the is close Close layer 147 it is Chong Die with band-like the 2nd cathode interarea 120b of negative plate 120x in the state of band-like 1st partition board 130x, it is band-like bear Pole plate 120x and band-like 2nd partition board 140x, in the longitudinal direction continuous pressure and make its integration.It is formed as a result, close by the 3rd Close layer 137 keep band-like 1st partition board 130x and band-like negative plate 120x closely sealed and by the 4th sealing layer 147 make the band-like 2nd every Plate 140x and band-like complex 150 closely sealed band-like negative plate 120x.
Then, in " the 2nd roll process S6 ", the 110 integrated band of positive plate of band-like complex 150 and square shape is obtained Shape electrode laminated body 100x.Specifically, on the 2nd sealing layer 143 of the 2nd partition board 140 of band-like complex 150, will utilize Device (not shown) cuts off band-like positive plate and is overlapped as the positive plate 110 of rectangle.By the band-like complex 150 and positive plate 110 the 3rd pressure roller 251 in the 2nd roll-in portion 250 keeps its integrated with pressurizeing in the gap of the 4th pressure roller 253.It is formed as a result, logical Crossing the 2nd sealing layer 143 makes band-like complex 150 and the closely sealed band electrode laminated body 100x of positive plate 110.
However, in the 2nd sealing layer 143, the population N2 of the 2nd polyethylene particles 144 of unit area is than the 1st sealing layer 133 few (N2=1.1 × 10 in present embodiment7A/cm2), in order to keep band-like complex 150 closely sealed well with positive plate 110 And need high pressing pressure.But roll-in, can be easily to band-like complex 150 and positive plate 110 compared with plane is suppressed Apply high pressing pressure.Therefore, in the 2nd roll process S6, band-like complex 150 can be made fine with positive plate 110 Ground is closely sealed.
Then, by cutting portion 260 that band electrode laminated body 100x is every in the longitudinal direction in " cut off operation S7 " It is cut off every predetermined space, obtains the electrode laminated body 100 of rectangle.
Then, in " lamination process S8 ", iterating through plane compacting keeps electrode laminated body 100 closely sealed each other, forms electricity Polar body 20.Specifically, in plane pressing part 270, with the 1st sealing layer 133 of the 1st partition board 130 of electrode laminated body 100 with The mode that is overlapped of the positive plate 110 of another electrode laminated body 100 that is formed of front laminate, by the electrode laminated body 100 and this is another One electrode laminated body 100 is overlapped.Then, the upper mold 271 of plane pressing part 270 is made to decline, between upper mold 271 and lower die 273, It is pressurizeed to multiple electrodes laminated body 100 using plane compacting, makes the electrode laminated body 100 by the 1st sealing layer 133 and be somebody's turn to do Another electrode laminated body 100 is closely sealed.In this way, be repeated pre-determined number makes new electrode laminated body 100 front laminate shape therewith At another electrode laminated body 100 it is closely sealed, form multiple electrodes laminated body 100 and be laminated and the electrode body 20 of integration.
However, as described above, population N1 (this reality of the 1st polyethylene particles 134 of the unit area of the 1st sealing layer 133 Apply N1=2.7 × 10 in mode8A/cm2) than the 2nd sealing layer 143 unit area the 2nd polyethylene particles 144 population (N2=1.1 × 10 in present embodiment N27A/cm2) more (N1 > N2) (with reference to Fig. 2 and Fig. 3).Therefore, in lamination process S8 In when keeping electrode laminated body 100 closely sealed each other by the 1st sealing layer 133, the 1st polyethylene particles 134 of the 1st sealing layer 133 with The contact point of positive plate 110 increases, and the closing force of the 1st sealing layer 133 and positive plate 110 enhances.
On the other hand, in the case that the population N1 of the unit area of the 1st sealing layer 133 is identical population, according to making Surface pressure when electrode laminated body 100 is closely sealed each other is enhanced by the closing force that the 1st sealing layer 133 is realized.That is, if increasing face Pressure, then the 1st polyethylene particles 134 generation moderate finite deformation of the 1st sealing layer 133, the 1st sealing layer 133 connect with positive plate 110 Contacting surface product increases, and the closing force of the 1st sealing layer 133 and positive plate 110 enhances.On the contrary, if reducing surface pressure, the 1st poly- second The deformation of alkene particle 134 is smaller, and the contact area of the 1st sealing layer 133 and positive plate 110 reduces, the 1st sealing layer 133 and anode The closing force of plate 110 weakens.
1st sealing layer 133 of the electrode laminated body 100 of present embodiment, the 1st polyethylene particles 134 of unit area For population N1 than the 2nd sealing layer more than 143, therefore when keeping electrode laminated body 100 closely sealed each other by the 1st sealing layer 133, the 1st is close The 1st polyethylene particles 134 and the contact point of positive plate 110 for closing layer 133 increase, and the closing force of the 1st sealing layer 133 becomes than the The closing force of 2 sealing layers 143 is strong.Therefore, even if reducing face pressure when being pressurizeed and keeping electrode laminated body 100 closely sealed each other Power can also make the 1st sealing layer 133 and positive plate 110 closely sealed well, therefore in lamination process S8, pass through plane pressure System can be closely sealed well each other by electrode laminated body 100.
Then, in " assembling procedure S9 ", assembled battery 1.Specifically, preparing shell The lid component 13, in the case lid Positive terminal component 50 and negative terminal component 60 (referring to figure 5 and figure 6) are fixedly installed on component 13.Then, by positive terminal Component 50 and negative terminal component 60 respectively with the positive exposed division 110m and negative plate 120 of positive plate 110 among electrode body 20 Cathode exposed division 120m welding.Then, make 19 jacketed electrode body 20 of insulation film enclosure body, be inserted into housing body component In 11, and block with shell The lid component 13 opening of housing body component 11.By housing body component 11 and shell The lid component 13 welding, form battery case 10.Then, it is made to be infiltrated in electricity out of liquid injection hole 13h injection battery cases 10 electrolyte 17 In polar body 20.Then, liquid injection hole 13h is sealed by containment member 15.Then, various inspections are carried out to the battery 1.As a result, Complete battery 1.
As described above, in the manufacturing method of battery 1, in the 2nd roll process S6, pressurizeed using roll-in, it is close by the 2nd Closing layer 143 keeps band-like complex 150 and positive plate 110 closely sealed.In 2nd sealing layer 143, the 2nd polyethylene particles of unit area 144 population N2 is fewer than the 1st sealing layer 133, is needed to keep band-like complex 150 and positive plate 110 closely sealed well High pressing pressure.But roll-in easily can apply height compared with plane is suppressed to band-like complex 150 and positive plate 110 Pressing pressure.Therefore, band-like complex 150 can be made closely sealed well with positive plate 110 by roll-in.
On the other hand, it in lamination process S8, is pressurizeed using plane compacting, electrode layer is made by the 1st sealing layer 133 Stack 100 is closely sealed each other.In 1st sealing layer 133, the population N1 of the 1st polyethylene particles 134 of unit area is more closely sealed than the 2nd Layer more than 143, compared to band-like complex 150 and the closely sealed situation of positive plate 110 is made, can pass through reducing pressing pressure 1st sealing layer 133 obtains good adaptation, therefore electrode laminated body 100 can be made close well each other by plane compacting It closes.Thus it is possible to which the plane pressing part 270 of carry out plane compacting is made to minimize, or speed of production is improved, electrode can be inhibited The manufacturing cost of body 20 and battery 1 makes the price reduction of battery 1.
In addition, in the present embodiment, the average grain diameter D1 of the 1st polyethylene particles 134 of the 1st sealing layer 133 is made to be less than The average grain diameter D2 (D1 < D2) of 2nd polyethylene particles 144 of the 2nd sealing layer 143, therefore it is easy the list in the 1st sealing layer 133 Plane product configures the 1st more polyethylene particles 134, and the population N1 for being easy the 1st polyethylene particles of setting unit area increases The 1st more sealing layers 133.
In addition, in the present embodiment, the average grain diameter D1 of the 1st polyethylene particles 134 of the 1st sealing layer 133 is set as 0.3~1.0 μm, therefore the 1st polyethylene particles 134 are easily processed, it is easy closely sealed using the setting the 1st of the 1st polyethylene particles 134 Layer 133.In addition, the average grain diameter D2 of the 2nd polyethylene particles 144 of the 2nd sealing layer 143 is set as 2.0~4.0 μm, therefore hold Disposable 2nd polyethylene particles 144 are easy that the 2nd sealing layer 143 is arranged using the 2nd polyethylene particles 144.
(test result)
Then, the result of the experiment to being carried out to verify the effect of the present invention illustrates.It is and upper as embodiment State embodiment and be carried out similarly positive plate formation process S1~cut off operation S7, form electrode laminated body 100, then with implementation The lamination process S8 of mode pressurizes to electrode laminated body 100 likewise by plane compacting, makes electrode laminated body 100 each other Integration.At this point, to the electrode laminated body 100 that is newly laminated therewith the position offset of another electrode laminated body 100 of front laminate, Specifically position offset of the electrode laminated body 100 on 270 conveying direction of plane pressing part (left and right directions in Fig. 8) (mm) it is measured.The measurement of the position offset is carried out to the stacking of 34 electrode laminated bodies 100 respectively.It the results are shown in The chart of Fig. 9.
On the other hand, as comparative example, in the same manner as the formation of the 2nd sealing layer 143 in the 2nd partition board formation process 4 into The formation of the 1st sealing layer 133 in the 1st partition board formation process S3 of row.That is, in the 1st partition board formation process S3, make binder 135 and D2=3.0 μm of average grain diameter the 2nd polyethylene particles 144, the ratio with the 2nd polyethylene particles 144 is 95wt%, viscous The ratio for tying agent 135 is the mode of 5wt%, is scattered in decentralized medium (water).The dispersion liquid is coated on the 1st diaphragm body 131 The 1st interarea 131a, and be thermally dried, form the 1st sealing layer that thickness is 5 μm.
Embodiment is related to as a result, the 1st sealing layer 133 as shown in Fig. 2, the 1st polyethylene particles 134 of unit area grain Subnumber N1 is more, in contrast, the 2nd sealing layer 143 of the 1st sealing layer that comparative example is related to as shown in figure 3 similarly, unit plane The population of long-pending polyethylene particles (the 2nd polyethylene particles 144) is reduced.For the electrode laminated body that the comparative example is related to, with Embodiment pressurizes to electrode laminated body 100 likewise by plane compacting, and electrode laminated body 100 is made to be integrated with each other, point The position offset (mm) generated at this time is not measured.Furthermore the surface pressure of plane compacting is sized to the identical value of embodiment. The result of position offset is shown in the chart of Fig. 9.
By the chart of Fig. 9 it is found that about by ▲ label indicate comparative example electrode laminated body, in lamination process S8, It will produce the position offset between larger electrode laminated body (maximum generates the position offset of 1.0mm or so).With this Relatively, about by ■ label indicate embodiment electrode laminated body 100,100 mutual electrode laminated body of electrode laminated body that Position offset between this reduces (the maximum position offset for only generating 0.2mm or so).Think the reason of result as causing By as described below.
That is, the 1st sealing layer of the electrode laminated body of comparative example, as described above, (the 2nd is poly- for the polyethylene particles of unit area Beta particles 144) population (be similarly 1.1 × 10 with the population N2 of the 2nd sealing layer 1437A/cm2) few (with reference to Fig. 3). Therefore, when keeping electrode laminated body closely sealed each other by the 1st sealing layer in lamination process S8, the polyethylene particles of the 1st sealing layer (the 2nd polyethylene particles 144) and the contact point of positive plate 110 are reduced, and the closing force of the 1st sealing layer and positive plate 110 weakens.Institute In lamination process S8, to be pressurizeed and be made to electrode laminated body between the upper mold 271 and lower die 273 of plane pressing part 270 When electrode laminated body is closely sealed each other, electrode laminated body is easy offset, will produce larger position offset.Confirm to reduce this Position offset increases the surface pressure of plane compacting.But in order to increase the surface pressure of plane compacting, it is necessary to make plane The enlargement of pressing part 270, or slow down the speed of production of lamination process S8, therefore being manufactured into for electrode body 20 and battery 1 can be made Originally increase, not preferably.
On the other hand, the 1st sealing layer 133 of the electrode laminated body 100 of embodiment, as described above, the 1st of unit area is poly- The population N1 (2.7 × 10 of beta particles 1348A/cm2) than the population N2 (1.1 × 10 of the 2nd sealing layer 1437A/cm2) It is more.Therefore, when keeping electrode laminated body 100 closely sealed each other by the 1st sealing layer 133 in lamination process S8, the 1st sealing layer 133 The 1st polyethylene particles 134 and the contact point of positive plate 110 increase, the closing force of the 1st sealing layer 133 and positive plate 110 increases By force.Therefore, even if keeping the pressing pressure in lamination process S8 lower than the pressing pressure in the 2nd roll process S6, in lamination process It is pressurizeed to electrode laminated body 100 between the upper mold 271 and lower die 273 of plane pressing part 270 in S8 and makes electrode laminated body 100 it is closely sealed each other when, electrode laminated body 100 is also difficult to deviate, it is difficult to generation position deviate.
More than, by embodiment, the present invention is described, but the present invention is not limited to the above embodiments, can It is applied with suitably changing within the scope of its spirit.

Claims (6)

1. a kind of electrode laminated body, which is characterized in that have the 1st partition board, the 1st electrode plate, the 2nd partition board, the 2nd electrode plate,
The electrode laminated body is by the 1st partition board, the 1st electrode plate, the 2nd partition board, the 2nd electrode plate with sequence stacking and integration Made of,
1st partition board there is the 1st diaphragm body comprising multiple aperture plasma membrane and be formed in the 1st diaphragm body with it is described 1st sealing layer of the Porous on the interarea of the 1st electrode plate side opposite side, the 1st sealing layer include the 1st polyethylene particles, With the bonding for bonding the 1st polyethylene particles each other and by the 1st polyethylene particles and the 1st diaphragm body Agent,
2nd partition board there is the 2nd diaphragm body comprising multiple aperture plasma membrane and be formed in the 2nd diaphragm body with it is described 2nd sealing layer of the Porous on the interarea of the 1st electrode plate side opposite side, the 2nd sealing layer and the 2nd electrode plate are close It closes, comprising the 2nd polyethylene particles and by the 2nd polyethylene particles each other and by the 2nd polyethylene particles and described the The binder that 2 diaphragm bodies bond,
The population of the 1st polyethylene particles of the unit area of 1st sealing layer, than the unit of the 2nd sealing layer The population of the 2nd polyethylene particles of area is more.
2. electrode laminated body according to claim 1, which is characterized in that
The average grain diameter of 1st polyethylene particles is less than the average grain diameter of the 2nd polyethylene particles.
3. electrode laminated body according to claim 2, which is characterized in that
The average grain diameter of 1st polyethylene particles is 0.3~1.0 μm,
The average grain diameter of 2nd polyethylene particles is 2.0~4.0 μm.
4. a kind of manufacturing method of battery,
The battery has multiple electrodes laminated body is laminated made of laminated type electrode body, the electrode laminated body is by the 1 partition board, the 1st electrode plate, the 2nd partition board and the 2nd electrode plate are laminated with the sequence and made of integrations,
1st partition board there is the 1st diaphragm body comprising multiple aperture plasma membrane and be formed in the 1st diaphragm body with it is described 1st sealing layer of the Porous on the interarea of the 1st electrode plate side opposite side, the 1st sealing layer include the 1st polyethylene particles, With the bonding for bonding the 1st polyethylene particles each other and by the 1st polyethylene particles and the 1st diaphragm body Agent,
2nd partition board there is the 2nd diaphragm body comprising multiple aperture plasma membrane and be formed in the 2nd diaphragm body with it is described 2nd sealing layer of the Porous on the interarea of the 1st electrode plate side opposite side, the 2nd sealing layer and the 2nd electrode plate are close It closes, comprising the 2nd polyethylene particles and by the 2nd polyethylene particles each other and by the 2nd polyethylene particles and described the The binder that 2 diaphragm bodies bond,
The population of the 1st polyethylene particles of the unit area of 1st sealing layer, than the unit of the 2nd sealing layer The population of the 2nd polyethylene particles of area is more,
The manufacturing method of the battery is characterised by comprising：
By respectively become by cut-out the 1st partition board, the 1st electrode plate and the 2nd partition board band-like 1st partition board, Band-like 1st electrode plate and band-like 2nd partition board form integrated band-like complex with sequence stacking；
It, will be described band-like compound in such a way that the 2nd sealing layer of band-like 2nd partition board is Chong Die with the 2nd electrode plate Body is Chong Die with the 2nd electrode plate, is pressurizeed, is made described band-like to the band-like complex and the 2nd electrode plate by roll-in Complex and the 2nd electrode plate are closely sealed, obtain band electrode laminated body；
The band electrode laminated body is cut off, the electrode laminated body of predetermined shape is formed；
Following steps form the electrode body repeatedly：With the 1st sealing layer of the 1st partition board of the electrode laminated body The electrode laminated body and another electrode are laminated the mode Chong Die with the 2nd electrode plate of another electrode laminated body Weight is folded, is pressurizeed to the electrode laminated body and another electrode laminated body by plane compacting, keeps the electrode laminated body another with this One electrode laminated body is closely sealed.
5. the manufacturing method of battery according to claim 4, which is characterized in that
The average grain diameter of 1st polyethylene particles is less than the average grain diameter of the 2nd polyethylene particles.
6. the manufacturing method of battery according to claim 5, which is characterized in that
The average grain diameter of 1st polyethylene particles is 0.3~1.0 μm,
The average grain diameter of 2nd polyethylene particles is 2.0~4.0 μm.
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